Combination exhaust and intake manifold



r c. c. HERBERT. COMBUSTION EXHAUST AND INTAKE MANIEGLDy APPLICATION FILED SEPT-4, I917.

Patentefl June 17, 1919.

Why/ri s flilelbemi.

ATTORNEYS.

m2 mamas wnqns 0a.. rm nourna. wumnumu. n. c

CHARLES C. HERBERT, OF SAN JOSE,

CALIFORNIA.

COMBINATION EXHAUST AN D INTAKE MANIFOLD.

Specification of Letters Patent.

Patented June 17, 15919.

Application filed September 4, 1917. Serial No. 189,525.

To all whom it may concern:

Be it known that I, CHARLES C. HERBERT, a citizen of the United States, residing at San Jose, in the county of Santa Clara and State of California, have invented new and useful Improvements in Combination Exhaust and Intake Manifolds, of which the following is a specification.

This invention relates to internal combustion engines, and contemplates the provision of improved means for heating the explosive mixture employed precedent to the passage of such mixture into the explosion chambers or cylinders of the engine.

One of the objects of the present invention is to provide an intake manifold, each branch of which consists of a plurality of tubes connected at one end with a suitable form of carbureter and at the opposite end with the inlet port of an engine. Another object of the invention is to provide a caslng for said tubes throughwhich the exhaust gases are passed to heat the tubes of which the inlet manifold is constructed. Further objects will hereinafter appear.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accompanying drawings, in which Figure 1 is a front view, partly in section, showing the combination exhaust and intake manifold.

Fig. 2 is a plan section, taken on the line 2-2 of Fig. 1.

Fig. 3 is a cross section on line 33 of Fig. 1.

Referringto the drawings in detail, A indicates, in general, an exhaust manifold consisting of a horizontal section 2 and a centrally positioned vertical section. 3. These sections are connected in the usual manner so as to communicate with each other, and the upper section 2 is provided with a series of exhaust and intake ports, such as shown at l and 5, respectively. The whole manifold may be secured to the engine in any suitable manner, but preferably as here shown by bolts 6 which pass throughtubes 7 secured within the manifold casing. The exhaust gases entering the upper section of the manifold through the ports 4 flow toward the center thereof in the direction of the arrows, and from this point pass in a downward direction through the vertical Section 3 and out through an outlet opening 8 directly into the atmosphere or into a pipe which may conduct the gases to any convenient point.

Formed on the lower end of the vertical section 3 of the manifold is a cup-shaped flanged member 9, to which a carbureter of any suitable construction may be attached, and forming a bottom for said flanged, cupshaped member is a plate 10 which is provided for the purpose of receiving a plurality of tubes, generally indicated at 11. Said plate 10 also prevents the exhaust gases from passing down into the carbureter and, therefore, serves as a baffle which directs the escaping gases out through the discharge opening 8. The plate 10 may be drilled or otherwise prepared for the reception of the tubes 11, and these tubes may in turn be secured in their respective openings by being screwed therein, welded, brazed or in any other suitable manner.

The individual tubes are preferably spaced apart, as shown in Figs. 1 and/2, a suflicient distance to permit the exhaust gases discharging to play between the tubes and heat their entire surface. They are otherwise extended upwardly through the vertical section of the manifold and are then bent, as at 12, and extended to the respective intake ports 5.

- The present manifold shown is provided with four exhaust ports and four intake ports, and four independent tubes are connected with each of the intake ports. There are sixteen tubes in all which are connected through the plate 10 and the connection 9 with the carbureter. An enormous heating surface is in this manner provided as each manifold connection consists of fouritubes, the combined areas of which are equal to the area of the intake port. This isone of the most important features of the present invention as it provides a large heating area over which the incoming explosive mixture must pass before it can enter the cylinders of the engine. The incoming explosive mixture, furthermore, passes through tubes of such small area that the heathig of practically all the gas is permitted, thus forming a fixed, comparatively dry gas, which, when compressed and fired, permits a substantial and complete combustion of the mixture, thereby overcoming such troubles as carbon deposits in the cylinders, smoking through the exhaust, and dilution of the lubricating oils employed.

Most internal combustion engines employed today meet with considerable difficulty when attempting to burn low gravity oils, such as kerosene, distillate, and particularly when attempting to burn low grade distillates. This diliiculty is due to the fact that the gases formed in the carbureter recondense on the inner surface and passages formed in the manifolds. This re-condensed liquid enters the cylinders as such and not as a gas. It cannot, therefore, burn quickly enough to be entirely removed and hence produces considerable smoke and carbon deposit within the cylinders. This is practically overcome in the present instance, due to the large heating area presented which prevents recondensation.

Another feature which has not been overcome in the ordinary engine is the proper heating of the incoming mixture. This is due to the fact that the branches of the manifold are usually so large that only the exterior layer of the incoming mixture is heated while the center portion or core remains entirely cold. This feature, as can be seen by referring to the drawings and my previous statements, has been entirely overcome in the present instance by dividing each branch of the manifold into a plurality of tubes, thereby presenting an enormous heating surface over which individual small streams of gas pass. These streams may be heated uniformly and thoroughly, thereby forming a perfect and dry gas which, when admitted to the cylinder, does not have a tendency to recondense and is, therefore, completely consumed when ignited.

The individual tubes forming each branch of the manifold are completely inclosed by the exhaust manifold and as they are entirely separated with relation to each other, the exhaust gases are permitted to pass freely between and around same before they are finally permitted to escape through the discharge opening 8.

lhe device as a whole is simple and sub stantial in construction and it has been found in actual practice that it requires very much less space than the separate exhaust and intake manifolds 110w employed. lVhile a channel iron, such as shown at 14, is provided as a face plate for the present manifold and comparatively thin sheet iron 15 which is welded thereto has been employed as a housing for the exhaust gases, it is obvious that any other material may be employed. I also wish it understood that steel or copper may be employed, as far as the tubes 12 are concerned,.and that their ends may be secured by brazing, welding, or any other means; also that the materials and finish of the several other parts of the device may besuch as the experience and judgment of the manufacturer may dictate.

Having thus described my invention what I claim and desire to secure by Letters Patent is 1. An inlet manifold for internal combustion engines comprising a plurality of short and a plurality of long arms all connected at their lower ends with a carburetor, and each connected at the upper end with an engine inlet port, said arms each comprising a plurality of tubes separated with re-' lation to each other, and an exhaust manifold inelosing all the arms and adapted to apply more heat to the short arms comprising the inlet manifold.

2. A manifoldcomprising a casing haiung a plurality of 'inle't'ports and an outlet port formed therein for exhaust gases, also a common'inletport and a plurality of outlet ports for an explosive mixture, and a pluralityof tubes connected with each outlet port for the explosive mixture atone end and at their opposite ends with the common inlet port for the explosive mixture, said tu'besbeing all positioned within the casing and separated to permi t the exhaust gases in theiivpassage through the casing to pass freely between and around the tubes.

3. The combination with an internal combustion engine having a plurality of-inlet ports formed therein and a carburetor, of a 4 connection between each inlet port and the carburetor, each of said connections comprising a plurality of separated tubes, means for heating said tubes, said means comprising a casing surrounding the tubes forming each connection, and means for passing exhaust gases through said casing and between the tubes.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

CHARLES o. HERBERT.

Witnesses:

WM. W. Bneos, R. C. MoCoMIsH.

Copies of this patent may be obtained forifive cents each -by addressing the Commissioner of .Iatents, Washington, D..0. 

